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Hard drive query.

Hello,

I bought a new PC yesterday, set it up today. I don't have a windows boot disk at the moment, so I plugged in my old hard drive from the previous computer. The computer won't boot correctly - It recognises the drive, and can get to the 'Loading windows' screen, but then a very very brief bluescreen occurs, and it goes into repair mode. It announces that it's repairing HDD files, then reboots, and the same occurs.

Does anyone know what could be happening, why this may be?

(Not sure if this is relevant, but I haven't installed the mobo drivers, GPU drivers, etc.)

You can sometimes swap a boot disc from one PC to another and they'll work - but most of the time it will just BSOD either on startup or shortly thereafter.

If you're deadly keen to keep your Windows installation 'as is' and you can get access to the same installation disc you used originally, you can try a 'Repair Install' which will replace all the system files with 'the right ones' for that system - it should then startup and make you dance for hours replacing drivers and other stuff - but will eventually run.

It will never be ideal tho - you're bound to have stuff installed you don't want and other 'issues' which may or may not bite you later - your best bet is a clean install really...

Pretty sure I know what is happening here.
Your new PC has the SATA system set to "AHCI mode" - the more modern and genreally preferable mode. However you were previously running in "IDE mode" - and Windows only installs the drivers for AHCI during its own install.
Switch over to IDE mode in the BIOS and you'll be fine in al probability (there is a way to force windows to install AHCI drivers later too)